Hand screw-clamp.



H. GEISEN HUNER.

HAND SCREW CLAMP.

APPLICATION FILED MAY 9, 1907.

Patented July 30, 1912.

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W/Zfl76656k5/ 4 M HENRY .GEISE H6NER, 0F ,SCHENEGTADY, NEW

YoRK, ASSIGNOR TO FREDERICK KELLEY, OF NORTH BORO, MASSACHUSETTS.

HAND SCREW-CLAMP.

Specification of Letters Patent.

Patented July so, 1912.

Application filed May 9, 190?. Serial No. 372,721.

To aZZ w/wm it may concern:

Be it known that I, HENRY GEIsE I-IoNE a citizen of the United States, residing at Schenectady, county of vSchenectady, State of New York, have invented certain new and useful Improvements in Hand Screw- Clamps, of which the following is a specification.

My inventicn relates to hand screw clamps so largely used in woodworking, and finds a ready application wherever such a device maybe needed or desired; and the invention aims toprovide a hand screw clamp which will be stronger, more durable and permit of wider use than the ordinary wooden clamp. Inthe use of these devices is often necessary to subject the work being clamped to a flame or other source of high temperature, and when the clamp is constructed of wood this frequently results in great damage, or it may be that the clamp is entirely destroyed.

To overcome this defect and also to carry out the other features of my invention, I construct my clamp of sheet metal such as sheet iron which I will now proceed to describe in detail in connection with the accompanying drawings, in which- Figure 1 is a side view of a complete clamp, with certain portions broken away; Fig. 2 is a top plan view of one of the jaws of the clamp; Fig. 3 is an end view of one of the jaws of the clamps; and Figs. 4 and 5 are views of the cap for the end of the hand screws.

' In constructing the jaws A A of my clamp, I prefer to employ punched sheet metal blanks of suitable size and shape, having openings H for the passage of thehand screws. These blanks are first placed in suitable dies and stamped to form the enlarged portions or openings a, a, a, the

two vertical parallel sides Z) I), and in tlie case of the jaw A, the'circular recess G, which latter forms a bearing surface for the end of one of the hand screws BC The blanks are then bent so as to bring the two vertical parallel sides together, or approximately so, for riveting or being otherwise securely united to form a back.

Before the two vertical sides are fastened together, I insert in the enlarged portions a a and in line with the openings H screwthreaded metal bushings C which are adapted to engage the threads of the hand screws B B, and inthe enlargement a is a like bushing, except that it has a smooth bore. These bushings may made from any suitable material, such as'Babbit metal, metal tubing, etc, and are of such diameter that when the two sides 6 b are riveted together the bushings ar securely clamped and held by the enlarged portions an a of the jaw, one end of the bushings abutting against the front walls of the jaws. As a further means ofsecuring them in place, each bushing is providedwitli a rib or collar 0' which engages the inner sides'of the jaw and prevents the bushing from turning or working out when power is applied to the hand screws? After the bushings are inserted the two vertical sides I) b are fastenedto ether, preferably by rivets, as at yr, etc., forming a hollow approximately triangular-shaped jaw which is entirely" inclosed and possesses great strength with comparative lightness. This triangular jaw ismade up of aflat front, integral inclined sides and a back 7) Z To give thejaws additional strength, I may employ reinforcing "strips of metal D. These strips are'jplaced'inside of thejaws andhave one of their edges secured thereto by the rivets 1 while th'e other edge bears against the inner side of thesface of the jaws. This latter edge ',I prefer to corrugate, asshown at cl, to give a wider bearing surfaceas well as additional strength.

The hand screws B B I prefer to make from metal tubing and roll rather than out the threads thereon. Each screw has secured to it a'han dle F, and while I have shown these handles as made from metal and of heXagon shape, it will of course be understood that they may be niade from any suitable material and shaped as desired. 1 On the opposite endsfofthe screws are metal gygint hangeable they are both provided with these metal caps which prevent the threads from being forced in cont-act with the edge of the recess G. s

A hand screw clamp constructed as above described possesses all of the useful features of the wooden clamp and has the marked advantages of greater strength and durability, as Well as being adapted for certain uses for which the wooden clamp is worthless;

for instance, when the work engaged by the clamp is material under high temperature. The hollow jaws give a large radiating surface and do not become overheated, make the structure light, while at the same time possessing suflicient strength for all practical purposes. I

While I have prefer for the jaws it is obvious that they may be differently formed without depart-- ing from thespirit of my invention.

What I claim as new and desire to secure as Letters Patent of the United States is,-

1. As an article of manufacture, a hand screw clamp having jaws of sheet metal, each comprising a flat front wall, and in tegral side walls, closed at the back forming a complete inclosed hollow member, threaded bushings having their ends resting against the front walls of each jaw and engaging the side walls, and parallel screws passing through the bushings.

2. A hand screw clamp having hollow triangular sheet metal jaws provided with enlargements struck up from the side walls of' said jaws, the front walls of said jaws having openings in line with said enlargements, screw-threaded metal bushings located in said enlargements and abutting against the front walls, and parallel screws of metal tubing engaging with said bushm s.

g. In a hand screw clamp, hollow sheet metal jaws of approximately triangular shape, one or more openings in said jaws, metal bushings in said openings secured by the sides of the jaws, and one ormore reinforcing strips secured in said jaws having their free ends corrugated and resting on the inner face of the aws.

4. A hand screw clamp having sheet metal jaws of approximately triangular shape, enlarged portions in said jaws, metal bushings secured in said enlarged portions which engage the hand screws, a collar or projection on said bushings which engages the sides of the jaws, and hand screws of metal tubing having a handle at one end and a metal cap secured to the opposite end, substantially as described.

5. A hand screw clamp having sheet described the form which I metal jaws, each comprising two inclined side walls, said jaws having enlarged portions struck up from the side walls, a screwthreaded metal bushing secured in said enlargements and provided with a collar which engages the inner surface of the side walls, a reinforcing strip in said jaws having one edge corrugated and resting against the inner face of the front wall and its other edge secured to the sides of the jaw, and hand screws of metal tubing engaging said bushings.

6. A hand screw clamp having sheet metal jaws of approximately triangular shape, holes in the faces of the jaws and having a portion of their sides bent to form enlarged portions or openings in the tops of the jaws for the passage of the hand screws, metal bushings in said enlarged top portions having a collar which engages the inclined sides of the aws, one or more strips of metal in said jaws having a corrugated edge. resting on the inner face of the jaws, and the other edge secured to the two vertical sides of the jaws, and metal hand screws having a metal cap secured to the end passing through the aws.

7. A hand screw clamp having sheet metal jaws, holes in the faces of the jaws, metal bushings in said jaws each having a collar which engages the sides of the jaws, one or more strips of metal in said jaws having a corrugated edge resting on the inner face of the jaw, and metal hand screws passing through the jaws.

8. A hand screw clamp having sheet. metal jaws, each comprising two side walls, a screw-threaded metal bushing secured in said jaws and provided with a collar which engages the inner surfaces of the side walls, a reinforcing strip in said jaws having one edge corrugated and resting against the inner face of the front wall, and hand screws engaging said bushings.

In witness whereof, I have hereunto set my hand this 8th day of May, 1907.

HENRY GEISENHONER.

Witnesses:

MARGARET E. VVooLLnY, BERTHA SEooR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

